Make Espresso wait for WebView to finish loading

Question

Is there a reliable way to make Espresso wait for WebViews to finish loading?

I've tried the approach outlined here but found it unreliable. It also has other drawbacks:

• It relies on replacing the WebView's WebChromeClient. Any existing WebChromeClient can't be wrapped either, since WebViewrt doesn't have a getWebChromeClient() method for some reason.
• It requires a specific WebView instance, so every time I start an Activity with a WebView I have to get the WebView instance and register a new WebviewIdlingResource for it.

I'm hoping someone has a solution without any of these drawbacks. I had hopes that the espresso-web package might provide a solution, but it doesn't appear to offer anything relating to loading.

Answer 1

As you mentioned, there is an espresso add-on called espresso-web for dealing with webviews and their content.

"finish loading" is a bit of a vague concept. It will depend on what specifically to you want to finish.

If you use onWebView().check(<the you want to finish is in your webview>) that will return only after the web view has loaded and the check has succeeded.

Espresso-web is an entry point to work with WebViews on Android. It uses Atoms from the popular WebDriver API to introspect into and control the behavior of a WebView.

Similar to onData, WebView interactions are actually composed of several View Atoms. An Atom can be seen as a ViewAction, a self contained unit which performs an action in your UI. However, they need to be properly orchestrated and are quite verbose. Web and WebInteraction wrap this boilerplate and give an Espresso-like feel to interacting with WebViews.

https://developer.android.com/training/testing/espresso/web